package org.example.state;

import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;
import org.example.data.WaterSensor;
import org.example.function.WaterSensorMapFunction;

import java.time.Duration;
import java.util.ArrayList;
import java.util.List;

/**
 * 检测连续两个水位值超过10，报警
 */
public class KeyListStateDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        DataStreamSource<String> source = env.socketTextStream("localhost", 9999);
        SingleOutputStreamOperator<WaterSensor> sensorDS = source.map(new WaterSensorMapFunction());

        WatermarkStrategy<WaterSensor> waterSensorWatermarkStrategy = WatermarkStrategy
                //指定乱序的Watermark生成，延时。
                .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                .withTimestampAssigner((WaterSensor waterSensor, long l) -> {
                    //返回的时间戳 毫秒
                    return waterSensor.getTs() * 1000;
                });

        SingleOutputStreamOperator<String> process = sensorDS.keyBy(WaterSensor::getId).process(new KeyedProcessFunction<String, WaterSensor, String>() {
            //可以定义多个状态
            ListState<Integer> vcListState;
            //ValueState<String> lastIdValue;

            @Override
            public void open(Configuration parameters) throws Exception {
                super.open(parameters);
                vcListState = getRuntimeContext().getListState(new ListStateDescriptor<Integer>("lastVcValue", Types.INT));

            }

            @Override
            public void processElement(WaterSensor value, KeyedProcessFunction<String, WaterSensor, String>.Context ctx, Collector<String> out) throws Exception {
                vcListState.add(value.getVc());
                Iterable<Integer> vcListId = vcListState.get();
                List<Integer> vcList = new ArrayList<>();
                vcListId.forEach(v -> {
                    vcList.add(v);
                });
                vcList.sort(((o1, o2) -> {
                    return o2 - o1;
                }));
                if (vcList.size() > 3) {
                    vcList.remove(3);
                }
                out.collect("传感器：" + value.getId() + "，排名前3的水位：" + vcList.toString());
                vcListState.update(vcList);
            }
        });
        process.printToErr("排序结果");
        env.execute("KeyedStateDemo");
    }
}
